package uulm.teamname.marvelous.gamelibrary.gamelogic;

import uulm.teamname.marvelous.gamelibrary.Tuple;
import uulm.teamname.marvelous.gamelibrary.entities.Entity;
import uulm.teamname.marvelous.gamelibrary.entities.Character;
import uulm.teamname.marvelous.gamelibrary.events.*;
import uulm.teamname.marvelous.gamelibrary.requests.CharacterRequest;
import uulm.teamname.marvelous.gamelibrary.requests.Request;
import uulm.teamname.marvelous.gamelibrary.requests.RequestType;

import java.util.ArrayList;

/** Contains game logic handling. */
class GameLogic {
    /**
     * Produces resulting {@link Event}s from a given {@link Request} independently of any {@link GameState}.
     * @return The list of resulting events
     */
    public static ArrayList<Event> executeRequest(Request request) {
        ArrayList<Event> result = new ArrayList<>();

        switch(request.type) {
            case MeleeAttackRequest, RangedAttackRequest -> {
                CharacterRequest data = (CharacterRequest)request;
                result.add(new CharacterEvent()
                        .setOriginEntity(data.originEntity)
                        .setTargetEntity(data.targetEntity)
                        .setOriginField(data.originField)
                        .setTargetField(data.targetField)
                        .setAmount(data.value)
                        .type(request.type == RequestType.MeleeAttackRequest ? EventType.MeleeAttackEvent : EventType.RangedAttackEvent));
                result.add(new EntityEvent()
                        .setTargetEntity(data.originEntity)
                        .setTargetField(data.originField)
                        .setAmount(1)
                        .type(EventType.ConsumedAPEvent));
                result.add(new EntityEvent()
                        .setTargetEntity(data.targetEntity)
                        .setTargetField(data.targetField)
                        .setAmount(data.value)
                        .type(EventType.TakenDamageEvent));
            }
            case MoveRequest -> {
                CharacterRequest data = (CharacterRequest)request;
                result.add(new CharacterEvent()
                        .setOriginEntity(data.originEntity)
                        .setOriginField(data.originField)
                        .setTargetField(data.targetField)
                        .type(EventType.MoveEvent));
                result.add(new EntityEvent()
                        .setTargetEntity(data.originEntity)
                        .setTargetField(data.targetField) //when this event gets handled, the character already moved to the target field
                        .setAmount(1)
                        .type(EventType.ConsumedMPEvent));
                //TODO: execute character swap in GameLogic.executeRequest
            }
            case ExchangeInfinityStoneRequest, UseInfinityStoneRequest -> {
                CharacterRequest data = (CharacterRequest)request;
                result.add(new CharacterEvent()
                        .setOriginEntity(data.originEntity)
                        .setTargetEntity(data.targetEntity)
                        .setOriginField(data.originField)
                        .setTargetField(data.targetField)
                        .setStone(data.stoneType)
                        .type(request.type == RequestType.ExchangeInfinityStoneRequest ? EventType.ExchangeInfinityStoneEvent : EventType.UseInfinityStoneEvent));
                result.add(new EntityEvent()
                        .setTargetEntity(data.originEntity)
                        .setTargetField(data.originField)
                        .setAmount(1)
                        .type(EventType.ConsumedAPEvent));

            }
            case DisconnectRequest -> {
                result.add(new GameEvent()
                        .type(EventType.DisconnectEvent));
            }
        }

        return result;
    }

    /**
     * Checks a {@link Request} for validity for a {@link GameState}.
     * @param state The game state to check on
     * @param request The request to validate
     * @return Whether or not the request is valid
     */
    public static boolean checkRequest(GameState state, Request request) {
        //TODO: refactor this using errors
        try {
            switch(request.type) {
                case MeleeAttackRequest, RangedAttackRequest -> {
                    CharacterRequest data = (CharacterRequest)request;

                    Entity originEntity = state.entities.findEntity(data.originEntity);
                    if(originEntity == null || originEntity.getPosition() != data.originField || !(originEntity instanceof Character)) {
                        return false;
                    }
                    Character origin = (Character)originEntity;
                    Entity targetEntity = state.entities.findEntity(data.targetEntity);
                    if(targetEntity == null || targetEntity.getPosition() != data.targetField || !(targetEntity instanceof Character)) {
                        return false;
                    }
                    Character target = (Character)targetEntity;

                    if(origin.hp.getValue() <= 0 || !origin.isActive()) {
                        return false;
                    }
                    if(origin.ap.getValue() < 1) {
                        return false;
                    }
                    if(request.type == RequestType.MeleeAttackRequest && origin.meleeDamage != data.value) {
                        return false;
                    }else if(request.type == RequestType.RangedAttackRequest && origin.rangedDamage != data.value) {
                        return false;
                    }
                    if(target.hp.getValue() <= 0 || !target.isActive()) {
                        return false;
                    }

                    if(request.type == RequestType.RangedAttackRequest && origin.getPosition().distance(target.getPosition()) > origin.attackRange) {
                        return false;
                    }

                    //TODO: check line of sight in GameLogic.checkRequest

                    return true;
                }
                case MoveRequest -> {
                    CharacterRequest data = (CharacterRequest)request;

                    Entity originEntity = state.entities.findEntity(data.originEntity);
                    if(originEntity == null || originEntity.getPosition() != data.originField || !(originEntity instanceof Character)) {
                        return false;
                    }
                    Character origin = (Character)originEntity;

                    if(data.targetField.getX() < 0 || data.targetField.getX() >= state.mapSize.getX() || data.targetField.getY() < 0 || data.targetField.getY() >= state.mapSize.getY()) {
                        return false;
                    }

                    for(Entity entity: state.entities.findByPosition(data.targetField)) {
                        if(entity.blocksMovement()) {
                            return false;
                        }
                    }

                    if(origin.hp.getValue() <= 0 || !origin.isActive()) {
                        return false;
                    }
                    if(origin.mp.getValue() < 1) {
                        return false;
                    }

                    return true;
                }
                case ExchangeInfinityStoneRequest -> {
                    CharacterRequest data = (CharacterRequest)request;

                    Entity originEntity = state.entities.findEntity(data.originEntity);
                    if(originEntity == null || originEntity.getPosition() != data.originField || !(originEntity instanceof Character)) {
                        return false;
                    }
                    Character origin = (Character)originEntity;
                    Entity targetEntity = state.entities.findEntity(data.targetEntity);
                    if(targetEntity == null || targetEntity.getPosition() != data.targetField || !(targetEntity instanceof Character)) {
                        return false;
                    }
                    Character target = (Character)targetEntity;

                    if(origin.hp.getValue() <= 0 || !origin.isActive()) {
                        return false;
                    }
                    if(origin.ap.getValue() < 1) {
                        return false;
                    }
                    if(target.hp.getValue() <= 0 || !target.isActive()) {
                        return false;
                    }

                    if(!origin.inventory.hasStone(data.stoneType)) {
                        return false;
                    }

                    return true;
                }
                case UseInfinityStoneRequest -> {
                    CharacterRequest data = (CharacterRequest)request;

                    Entity originEntity = state.entities.findEntity(data.originEntity);
                    if(originEntity == null || originEntity.getPosition() != data.originField || !(originEntity instanceof Character)) {
                        return false;
                    }
                    Character origin = (Character)originEntity;
                    Entity targetEntity = state.entities.findEntity(data.targetEntity);
                    if(targetEntity == null || targetEntity.getPosition() != data.targetField || !(targetEntity instanceof Character)) {
                        return false;
                    }
                    Character target = (Character)targetEntity;

                    if(origin.hp.getValue() <= 0 || !origin.isActive()) {
                        return false;
                    }
                    if(origin.ap.getValue() < 1) {
                        return false;
                    }
                    if(!target.isActive()) {
                        return false;
                    }

                    if(!origin.inventory.hasStone(data.stoneType)) {
                        return false;
                    }

                    return true;

                }
                case DisconnectRequest -> {
                    //TODO: add check for DisconnectRequest in GameLogic.checkRequest

                    return true;
                }
            }
        }catch(Exception e) {
            return false;
        }

        return false;
    }

    /**
     * Applies an {@link Event} to a {@link GameState}.
     * @param state The game state to apply to
     * @param event The event to apply
     */
    public static void applyEvent(GameState state, Event event) {
        //TODO: implement GameLogic.applyEvent
    }

    /**
     * Checks a {@link GameState} for the current overtime win condition.
     * @param state The game state to check
     * @return The {@link ParticipantType} that is currently winning the game according to overtime ruling
     */
    public static ParticipantType checkWinConditions(GameState state) {
        //TODO: GameLogic.checkWinConditions is kind of ugly

        Tuple<ParticipantType, WinCondition> player1;
        Tuple<ParticipantType, WinCondition> player2;
        int value1;
        int value2;
        for(WinCondition condition: WinCondition.values()) {
            player1 = new Tuple<ParticipantType, WinCondition>(ParticipantType.Player1, condition);
            player2 = new Tuple<ParticipantType, WinCondition>(ParticipantType.Player2, condition);
            value1 = 0;
            value2 = 0;

            if(state.winConditions.containsKey(player1)) {
                value1 = state.winConditions.get(player1);
            }
            if(state.winConditions.containsKey(player2)) {
                value2 = state.winConditions.get(player2);
            }

            if(value1 > value2) {
                return ParticipantType.Player1;
            }
            if(value2 > value1) {
                return ParticipantType.Player2;
            }
        }

        return ParticipantType.None;
    }
}